I'll sleep on it.

一天學一個單字和成語(俚語)方法當然有很多，其中之一就是每天來「我在學英文」，首頁左下角類似聯播的「每日更新 Reading/Listening/Watching/Learning」有ESL Monkeys每日一字/一詞和每日成語/俚語，以下要分享的詞語就是今天和過去幾天的Daily Word/Phrase/Idiom/Slang -English Learning- ESL Monkeys
。

The best advice is found on the pillow

The best advice is found on the pillow: If someone says, "The best advice is found on the pillow," he/she means that it might not be good to worry about your problem now. You may be able to solve the problem after a good night's sleep. People often say "I'll sleep on it" to express the same idea.

Ex.
I don't think we can come up with any more answers tonight because we're all tired. Let's sleep on it. The best advice is found on the pillow.

Don't worry about it too much today. Go to bed now. The best advice is found on the pillow.

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well up

well up: when a liquid comes to the surface quickly.

When she heard the bad news, tears welled up in her eyes.

There was a pool where the water was welling up from an underground water source.

This phrasal verb can't be separated.
[V+ADV]

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★tap in

tap in: to press a series of keys in order to give information to a machine.

He went to the ATM, put his card in, and tapped in his PIN.

It's so easy to tap in a SMS on my new Motorola mobile phone! I love it!

This phrasal verb can be separated.

[V+ADV+N, V+N+ADV, V+PRON+ADV]